\begin{table}[h!]
\centering
\subtable[Female Age 20] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
    Vowel&Burg&Significance&Robust&Significance\\
    \hline
    a&-32.63&2.85e-10&-43.06&8.21e-12\\
    \hline
    i&-26.11&2.22e-11&-5.75&0.06\\
    \hline
    u&-73.76&7.87e-24&-62.15&7.58e-21\\
    \hline
  \end{tabular}
}
\label{fig:F20_AvDiv}
}
\subtable[Female Age 28] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&0.26&0.48&4.62&0.21\\
    \hline
    i&-36.86&2.71e-06&-20.46&0.006\\
    \hline
    u&-30.94&2.27e-10&-24.63&5.76e-06\\
    \hline
  \end{tabular}
}
\label{fig:F28_AvDiv}
}

\subtable[Female Age 40] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-0.35&0.41&8.22&1.71e-06\\
    \hline
    i&-38.17&8.02e-12&-14.91&0.005\\
    \hline
    u&-47.50&8.51e-22&-38.84&1.36e-14\\
    \hline
  \end{tabular}
}
\label{fig:F40_AvDiv}
}
\subtable[Female Age 60] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-31.67&1.81e-13&-39.75&1.50e-17\\
    \hline
    i&8.38&0.065&26.32&6.67e-07\\
    \hline
    o&-8.06&0.21&-23.94&0.21\\
    \hline
    u&-27.23&2.43e-08&-32.32&2.64e-08\\
    \hline
  \end{tabular}
}
  \label{fig:F60_AvDiv}
}

\subtable[Male Age 15] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-53.69&1.05e-15&-45.68&1.46e-12\\
    \hline
    i&-55.52&2.08e-12&-46.62&1.31e-09\\
    \hline
    u&-62.21&1.04e-21&-63.67&2.79e-22\\
    \hline
  \end{tabular}
}
\label{fig:M15_AvDiv}
}
\subtable[Male Age 40] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-30.50&1.16e-20&-11.70&0.00015\\
    \hline
    i&-32.83&8.33e-08&-29.84&5.99e-06\\
    \hline
    u&-36.64&4.40e-14&-35.68&6.05e-14\\
    \hline
  \end{tabular}
}
\label{fig:M40_AvDiv}
}

\subtable[Male Age 56] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-75.32&1.99e-18&-76.52&2.29e-19\\
    \hline
    i&-36.37&7.77e-09&-28.50&2.23e-08\\
    \hline
    u&-68.33&6.47e-25&-65.19&2.10e-21\\
    \hline
  \end{tabular}
}
\label{fig:M56_AvDiv}
}
\subtable[Male Age 66] {
{\scriptsize
  \begin{tabular}{|c|c|c|c|c|}
    \hline
Vowel & Burg & Significance & Robust & Significance\\
    \hline
    a&-33.74&1.16e-13&-31.30&4.62e-12\\
    \hline
    i&-40.80&2.05e-10&-15.49&0.0016\\
    \hline
    u&-33.26&4.45e-22&-41.62&2.09e-26\\
    \hline
  \end{tabular}
}
\label{fig:M66_AvDiv}
}
\caption{Average difference between measurements of two different microphones.}
\label{tab:rv_statistics}
\end{table}